GB1073620A - Binary data signal generating apparatus - Google Patents
Binary data signal generating apparatusInfo
- Publication number
- GB1073620A GB1073620A GB46489/65A GB4648965A GB1073620A GB 1073620 A GB1073620 A GB 1073620A GB 46489/65 A GB46489/65 A GB 46489/65A GB 4648965 A GB4648965 A GB 4648965A GB 1073620 A GB1073620 A GB 1073620A
- Authority
- GB
- United Kingdom
- Prior art keywords
- clock
- toggle
- signals
- train
- binary data
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired
Links
Classifications
-
- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06K—GRAPHICAL DATA READING; PRESENTATION OF DATA; RECORD CARRIERS; HANDLING RECORD CARRIERS
- G06K7/00—Methods or arrangements for sensing record carriers, e.g. for reading patterns
- G06K7/01—Details
- G06K7/016—Synchronisation of sensing process
- G06K7/0166—Synchronisation of sensing process by means of clock-signals derived from the code marks, e.g. self-clocking code
-
- G—PHYSICS
- G11—INFORMATION STORAGE
- G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
- G11B20/00—Signal processing not specific to the method of recording or reproducing; Circuits therefor
- G11B20/10—Digital recording or reproducing
- G11B20/14—Digital recording or reproducing using self-clocking codes
- G11B20/1403—Digital recording or reproducing using self-clocking codes characterised by the use of two levels
- G11B20/1407—Digital recording or reproducing using self-clocking codes characterised by the use of two levels code representation depending on a single bit, i.e. where a one is always represented by a first code symbol while a zero is always represented by a second code symbol
- G11B20/1419—Digital recording or reproducing using self-clocking codes characterised by the use of two levels code representation depending on a single bit, i.e. where a one is always represented by a first code symbol while a zero is always represented by a second code symbol to or from biphase level coding, i.e. to or from codes where a one is coded as a transition from a high to a low level during the middle of a bit cell and a zero is encoded as a transition from a low to a high level during the middle of a bit cell or vice versa, e.g. split phase code, Manchester code conversion to or from biphase space or mark coding, i.e. to or from codes where there is a transition at the beginning of every bit cell and a one has no second transition and a zero has a second transition one half of a bit period later or vice versa, e.g. double frequency code, FM code
Landscapes
- Engineering & Computer Science (AREA)
- Artificial Intelligence (AREA)
- Computer Vision & Pattern Recognition (AREA)
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Theoretical Computer Science (AREA)
- Signal Processing (AREA)
- Digital Magnetic Recording (AREA)
- Signal Processing For Digital Recording And Reproducing (AREA)
Abstract
1,073,620. Magnetic stores. INTERNATIONAL BUSINESS MACHINES CORPORATION. Nov. 3, 1965 [Nov. 20,1964], No. 46489/65. Heading G4C. [Also in Division H4] In a system for deriving double frequency signals from binary signals a stable oscillator produces a clock pulse train at twice the bit rate and means is provided for suppressing that clock pulse occurring at the middle of each bit of a particular one of the binary valves. From the clock pulses (a), Fig. 2 (not shown), from the oscillator (11), Fig. 1 (not shown), a second clock pulse train (b) at the bit rate is derived by way of a toggle (12). The first and second clock trains are gated together (13) (c) and delayed by <SP>1</SP>/ 3 bit period, the resultant signals gating (15) the binary data from a store. The signals (d) from the latter gate are passed to a toggle (14) fed also by the second clock train, this toggle's output (e) being gated (16) with the first clock train to provide the double frequency signals (f). These are fed via a toggle to a magnetic store.
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US412776A US3356934A (en) | 1964-11-20 | 1964-11-20 | Double frequency recording system |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| GB1073620A true GB1073620A (en) | 1967-06-28 |
Family
ID=23634437
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB46489/65A Expired GB1073620A (en) | 1964-11-20 | 1965-11-03 | Binary data signal generating apparatus |
Country Status (3)
| Country | Link |
|---|---|
| US (1) | US3356934A (en) |
| DE (1) | DE1474390B2 (en) |
| GB (1) | GB1073620A (en) |
Families Citing this family (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3641524A (en) * | 1966-11-07 | 1972-02-08 | Leach Corp | Magnetic record and reproduce system for digital data having a nrzc format |
| US3518648A (en) * | 1966-11-07 | 1970-06-30 | Subscription Television Inc | High density record and reproduce system |
| US3631428A (en) * | 1968-11-19 | 1971-12-28 | Pacific Micronetics Inc | Quarter-half cycle coding for rotating magnetic memory system |
| US3603942A (en) * | 1969-01-13 | 1971-09-07 | Ibm | Predifferentiated recording |
| US3633113A (en) * | 1969-12-22 | 1972-01-04 | Ibm | Timed pulse train generating system |
| US3720927A (en) * | 1971-01-25 | 1973-03-13 | Redactron Corp | Speed insensitive reading and writing apparatus for digital information |
| US3855616A (en) * | 1973-10-01 | 1974-12-17 | Ibm | Phase shift reducing digital signal recording having no d.c. component |
| US3859510A (en) * | 1973-12-26 | 1975-01-07 | Ibm | Data separation circuitry for reading information from a moving support |
| FR2439435A1 (en) * | 1978-10-19 | 1980-05-16 | Cii Honeywell Bull | WAY OF WRITING INFORMATION ON A MAGNETIC RECORDING MEDIUM |
| US4463359A (en) | 1979-04-02 | 1984-07-31 | Canon Kabushiki Kaisha | Droplet generating method and apparatus thereof |
-
1964
- 1964-11-20 US US412776A patent/US3356934A/en not_active Expired - Lifetime
-
1965
- 1965-11-03 GB GB46489/65A patent/GB1073620A/en not_active Expired
- 1965-11-20 DE DE19651474390 patent/DE1474390B2/en not_active Withdrawn
Also Published As
| Publication number | Publication date |
|---|---|
| DE1474390A1 (en) | 1969-08-07 |
| DE1474390B2 (en) | 1972-03-16 |
| US3356934A (en) | 1967-12-05 |
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